A12EH Toggle Switch SPDT Equivalent & Substitute Parts

Part Overview

The A12EH is an NKK Switches toggle switch with SPDT (Single Pole Double Throw) configuration, rated for 0.4VA at 28V AC/DC. This through-hole, right-angle mounted switch features a flatted polyamide actuator and is designed for applications requiring reliable on-on switching functionality. The part is active in production with 1,122 units in current inventory. Substitute parts may be required due to inventory constraints, lead time considerations, or specific application requirements within compatible electrical and mechanical parameters.

Substiute Parts

A12EH

NKK SwitchesIn Stock: 1186A12EH Datasheet

Current PartRFQ

34DWMSP11B4M6RT

Grayhill Inc.In Stock: 103334DWMSP11B4M6RT Datasheet

SimilarRFQ

34DWMSP15B4M6RT

Grayhill Inc.In Stock: 146734DWMSP15B4M6RT Datasheet

SimilarRFQ

ET01SD1ABE

C&KIn Stock: 900ET01SD1ABE Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the A12EH are qualified based on the following critical parameters that determine functional compatibility:

• Circuit Configuration: All substitutes maintain SPDT topology
• Switch Function: All substitutes maintain On-On operation
• Current Rating: All substitutes support 0.4VA (AC/DC)
• Mounting Type: All substitutes use through-hole, right-angle configuration
• Termination Style: All substitutes use PC Pin termination
• Operating Temperature Range: All substitutes support -30°C to 85°C
• Voltage Rating: Substitute parts are rated for 20V AC/DC, which is within the operational envelope of the 28V-rated main part

The identified substitutes (34DWMSP11B4M6RT, 34DWMSP15B4M6RT, and ET01SD1ABE) meet these core electrical and mechanical requirements. Differences in actuator type, actuator length, electrical life, and ingress protection rating do not preclude substitution but represent design variations within the SPDT toggle switch category.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts are active products with ROHS3 compliance, matching the regulatory status of the A12EH. Selection among substitutes should be based on application-specific requirements:

34DWMSP11B4M6RT and 34DWMSP15B4M6RT (Grayhill Inc., Series 34D): These parts provide IP67 ingress protection and are suitable for applications requiring enhanced environmental sealing. Both parts are electrically identical with 30,000-cycle electrical life ratings. Inventory availability is 971 and 1,438 units respectively.

ET01SD1ABE (C&K, Series ET): This part offers the highest electrical life rating at 60,000 cycles and IP57 ingress protection. REACH status is listed as affected for this part. Inventory availability is 800 units.

All substitutes operate within the -30°C to 85°C temperature range and maintain the required 0.4VA current rating and SPDT circuit configuration. The voltage rating difference (20V substitute vs. 28V main part) does not prevent substitution in applications operating at or below 20V.

Frequently Asked Questions (FAQ)

Q: Can the 34DWMSP11B4M6RT or 34DWMSP15B4M6RT be used as direct replacements for the A12EH?

A: Yes, within applications operating at 20V AC/DC or lower. Both parts maintain identical SPDT circuit configuration, 0.4VA current rating, through-hole right-angle mounting, and PC Pin termination. The primary differences are actuator geometry (standard round vs. flatted) and electrical life (30,000 vs. 50,000 cycles).

Q: What is the significance of the voltage rating difference between the A12EH (28V) and the substitute parts (20V)?

A: The substitute parts are rated for 20V maximum. They are suitable for applications operating at or below 20V. Applications requiring operation above 20V must use the A12EH or equivalent 28V-rated parts.

Q: How do the ingress protection ratings affect substitution?

A: The A12EH does not specify an ingress protection rating. The Grayhill substitutes (34DWMSP11B4M6RT, 34DWMSP15B4M6RT) provide IP67 protection, and the C&K substitute (ET01SD1ABE) provides IP57 protection. Enhanced ingress protection does not prevent substitution and may be beneficial in harsh environments.

Q: Are there differences in actuator length that affect mechanical fit?

A: Yes. The A12EH has a 10.00mm actuator length, while Grayhill substitutes have 10.70mm and the C&K substitute has 10.16mm. Panel cutout dimensions and mechanical clearances must be verified for the specific application before substitution.

Q: What is the difference in electrical life between these parts?

A: The A12EH is rated for 50,000 cycles, Grayhill parts for 30,000 cycles, and the C&K part for 60,000 cycles. Selection should reflect the expected operational cycle count for the application.

Q: Are all parts RoHS3 compliant?

A: Yes, all parts listed (A12EH, 34DWMSP11B4M6RT, 34DWMSP15B4M6RT, and ET01SD1ABE) are ROHS3 compliant and suitable for applications with RoHS requirements.